I have a #20-97780 MTH 100-ton covered hopped (TH&B 1504) and could use some advice disassembling and converting to 2-rail. There appear to be a total of 10 screws holding the floor/under frame to the body. It appears that perhaps the ends have to come off at the same time, undoing the four screws from the top of the ends to the roof walk area. Also, the fine wire air lines seems to be attached to the under frame and should come off at the same time. Once the body is off, it appears there are mounting bosses already in place that look as if they will accept kadees. The trucks I can likely deal with as they look like the same trucks on the MTH burro crane, which although fiddly I converted successfully using Intermountain wheelsets, which seem to fit fine. The Intermountain wheels are a tad smaller and would lower the car by 0.011"
i would appreciate thoughts and advice on this process - particularly on how to disassemble this thing!